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Consolidated Statements of Operations (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Sales:        
Product $ 15,622 $ 16,862 $ 48,954 $ 55,867
Service 28,833 27,388 81,661 66,290
Net sales 44,455 44,250 130,615 122,157
Costs and expenses:        
Costs of product sales 10,275 10,769 32,777 34,179
Costs of service sales 14,454 14,679 41,407 37,098
Research and development 3,472 3,283 10,704 10,832
Sales, marketing and support 7,889 8,105 24,251 23,252
General and administrative 8,159 6,898 23,436 17,300
Total costs and expenses 44,249 43,734 132,575 122,661
Income (loss) from operations 206 516 (1,960) (504)
Interest income 129 166 421 581
Interest expense 363 493 1,097 870
Other (expense) income, net (382) (156) 654 (70)
(Loss) income before income tax expense (benefit) (410) 33 (1,982) (863)
Income tax expense (benefit) 53 (118) (134) 54
Net income (loss) $ (463) $ 151 $ (1,848) $ (917)
Net (loss) income per common share        
Earnings Per Share, Basic and Diluted $ (0.03) $ 0.01 $ (0.12) $ (0.06)
Weighted average number of common shares outstanding:        
Weighted Average Number of Shares Outstanding, Basic 15,661 15,456 15,608 15,396
Diluted 15,661 15,586 15,608 15,396